Ltus tiers and alexander h



(No Model.)

J. H. PENDLETON.

MEANS PoR RBLIBVING PUMP VALVES. No. 373,479.

Patented Nov. 22 I 287.

Nv PETERS. Phowmhugnphm, wasmngnm, D. c.

UNITED STATES Afri-mr Priceo JOHN H. PENDLETON, OF BROOKLYN,

ASSIGNOR TO HIMSELF, AND CORNE- LIUS TIERS AND ALEXANDER H. TIERS, BOTH OF NEW YORK, N. Y.

MEANS FOR RELIEVING PUMP-VALVES` SPECIFICATION forming part of Letters Patent No. 373,479, dated November 22, 1887.

Application filed Deembrr 15, 1855.

To @ZZ whom i may concern.-

Be itkuown that I, JOHN H. PnNDLnToN, ot" Brooklyn, in the county of Kings and State of New York, have invented a new and useful 5 Improvement in Means for Relieving Pump- Valves, of which the following is a specification.

Y Myinvention is applicable to the dischargevalves of pumps which, when seated, have a Io larger area exposed to pressure on their backs than upon theirfaces; and the invention relates to such a valve having combined with it a motor consisting ot' a cylinder or chamber and a piston or diaphragm which is connected with the valve,and upon which pressureis eX- erted to assist the valve in opening.

The invention cousistsin novel combinations of parts, which are hereinafter particularly described, and pointed out in the claims, and all of which include a motor consisting of a piston or diaphragm which is connected with the valve and a chamber containing` the piston or diaphragm,and having on one side thereof avent and on the otherside thereof receiving the full pressure of liquid.

In the accompanying drawings, Figure l is a vertical section of the cylinder, valves, and piston or plunger of a single-acting pulnp embodying my invention; and Fig. 2 is a vertical 3o section of the cylinder, piston, and valves of a double-acting pump also embodying my invention.

Similar letters of reference designate corresponding parts in both figures.

Referring rst to Fig. l, A designates a cylinder, which has working Within it a singleacting piston or plunger, B, and which is contained within a water chest or chamber, G.

D is the suction-chest, with which the chest 4o Ccommunicates through asuction-valve, a,and above the upper portion of the chest C is a discha1ge-chest,E,with which the chest() communicates by a discharge-valve, b, and from which leads a pipe, c.

45 The valve b is seated upon the seat d, which,

as here shown, is made separate from the casing containing the chamber E, and the area exposed to pressure on the upper surface or back of the valve is considerably greater than 5o that exposed to pressure on the under side or face of the valve. In order to balance the Serial No. 185,696. (No model.)

valve and aid in its opening I have connected with ita motor, which, as here represented, consists of a movable diaphragm or piston, c, fitted to and working in a small cyliuder,f, and connected by a stem or rod with the valve. The cylinder or chamberf is entirely open on the lower or one side of the movable diaphragm or piston e, so that on one side such movable diaphragm or pistou is exposed to the full 6o pressure of liquid produced in the chamberor chest O by the movement of the piston or plunger B. On the opposite side ofthe movable diaphragm or piston c the cylinder or chamberjis closed byacap or cover, f', which, 65 as here represented, forms part of the removable valvc-seat d, and is connect-ed therewith by a sleeve receiving through it the stem which connects the valve and diaphragm. This cap or cover should close that end of the 7o cylinder or chamberf liquid-tight.

It will beobserved that the top of the sleeve which surrounds the stem connecting the valve b with the movable diaphragm or piston c terminates at the top ot' the valve-seat 75 d, and is closed by the valve b, and hence any leakage downward laround the valve -stem which would tend more or less to balance the pressure on the under side of the movable diaphragm or piston c is avoided.

From the cylinder or chamber on the side of the movable diaphragm or piston opposite to that on which the working pressure acts leadsa vent-pipe, g,which, as hererepresented, communicates with the bottom ofthe reservoir or tank F.

The purpose of the ventpipe g is to make the pressure on the opposite side of the movable diaphragm or piston eavailable, and this pipe therefore might communicate direct with the 9o atmosphere. In order, however, to save any liquid which might leak bet-Ween the movable diaphragm or piston and the chamber f, in which it Works, I employ the tank or chamber F, which may be closed at the top simply by a loose cap, h, to prevent dirt from falling thereinto, and which therefore contains only atmospheric pressure. If, in lieu ofthe movable diaphragm or piston e, a diaphragm Xed at its edge in the chamberfwere employed, roo the chamber or tank Fwould be unnecessary. I have also here represented a pipe, i, leading from the bottom of the tank or chamber F to the suction-chest D, and controlledby a floatactuated valve, j, so that when vthe water in the tank orrchamber F reaches the highest level desired the valve j will be opened and the water therein discharged into the suctionchest D. In lieu of employing` the pipe i and the float-valvej, I may connect Athe tank or chamber F directly with the chamber C by the ppei', as shown in dotted lines, Fig. l, and which is provided with a valve, i2, said valve being arranged Vto permit water to flow from the pipe z into the chamber O, and so as to prevent water from flowing in a' reverse direction. y

In Fig. 2 I have represented a double-acting pump, which comprises a cylinder, A, a piston, B,water chests or chambers@ C,which communicate by suction-valves a with the suctionAchest D, and a discharge-chest, E, which communicates by discharge-valves b with the water or pressure chambers C C. By the reciprocating movements of the piston B pressure will be alternately produced in the chambers C Cand when pressure is thus produced in one chamber the other chamber will be comparatively free from pressure, as the water stood that the area of the movablediaphragml or piston e should be atleast equal to and preferably slightly in excess of the difference in area between the back and face of the discharge-valve b. l

I have shown the movable diaphragm or piston e as having applied to ita spring, s, for

quickening its return movement after it has v been acted upon by pressure and quickly closing` the valve b.

It is important to have the chamber f open directly into the chamber C at oneside of the piston or movable diaphragm e, because the portion of the chamber which is below thesaid piston or diaphragm e in reality forms a part or continuation of the chamber C, and no pipes or small passages, which are liable to clog in pumping dirty water, are needed to conduct water to act on the piston or diaphragm e.

What I claim as my invention, and desire to secure by Letters Patent, is

l. The combination, with a cylinder and piston of apump and with the discharge-valves thereof, of a piston connected with the valve, a chamber wherein the piston is tted, and which receives on one side thereof the full pressure of fluid and is provided onthe other side thereof with a Vent-pipe communicating with the atmosphere, a chamber with which the ventpipe communicates, receiving any leakage therefrom, and a pipe for returning from said chamber to the suction-supply ofthe pump the liquid discharged through said venty pipe, substantially as'herein described.l

2. The combination, with a pump-piston, a chamber, C, wherein Huid is put under pressure by the movement ofthe piston,and a discharge- J. H. PENDLETON.

Witnesses:

FREDK. HAYNEs, v HENRY MCBRIDE. 

